<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    div{
        width: 100px;
        height: 100px;
        /* border-style: solid;
        border-width: 10px;
        border-color: salmon; */
        /* border: 10px solid salmon; */
        border-bottom: 10px solid salmon;
        border-top:1px dotted black;
        border-left: 5px double gold;
        border-right: 40px groove blue;
        /* 允许用特定方式定义匹配某个区域（不用算宽高，自动匹配） */
        box-sizing: border-box;
        
    }
    </style>
</head>
<body>
    <div></div>
</body>
</html>